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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b7cdf3e519476c6baf92f737a9edc954fe93ae5f608e79e07d23d229031a82c' 
  AND token = '9aFjjpofLBSRepTbblFse2jnY4Ykclp3flRNmY0q21k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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