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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63ea7ec025378cccb16a94f231a86102b95d6c7e2c0a28fe1bf8e55b3dafac9c' 
  AND token = '09SNYtZpxqEstgX33B5rNkTzRJtWaYK77pC2R6cheXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}