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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3c1c6afaa7b29144106631601348919b9b7db6385e222cb2e63ea722f1c81f0' 
  AND token = 'J0cct/VjpEI20hMWgz81uyr36zHeD2wq4U/I2TYt62o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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