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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6146193171f9e1bdbcfab6d5ddbd3e226b7808f996ea534f43722ba26ed50bf' 
  AND token = 'HfHxOjLZW34OxjohPRrWTRXAoG1ID9fg5Io9ImMHU6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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