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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af158847ab203a2c5a178f647a53ff7bcdb7d1bd7cbbb9427e7a9752907e6d5c' 
  AND token = '03XEk8fuyIyO25uPRLTcfqqnPHQfe1sgwOV47InJv5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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