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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6075c0b99859c5c1641ddf83643a18e4babe3a87189bd26fc2dd5455a32f9d8' 
  AND token = 'JRo5se5d5bZfPJMJ00DOMc5wYW3F9qF0HOKeZMtJ7ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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