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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4257c7783ce6f2e1fc29136da843ff4a566254adbcc0560cad3321ad2bdc2d4' 
  AND token = 'h1IynsxJdKm/RV9xspznScDOl7kp8rErPL3jrgLQ3yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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