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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a69b6f5e948444b1e3be9398ee033bdd54247dbe7abdaddbe603efbdd643473' 
  AND token = '5lMxKz7GSjjUKtka/hUzohuisMsZWcrBpAvvIdh520Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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