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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c919f90a52e8586ad32f05c7f437a94c86195779fd8981cf2f4d9263d0c2360' 
  AND token = 'bF4WyeNRgXbf6yxjJWZppbjFkFiXYjOJoaM9XaTYVIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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