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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97081ee5bcad9d77702500d403569e91ffe7a6a8c715f33f1bde92a73f643dc5' 
  AND token = '5uhNpAbJCGQGXberM3lC/zsR5dUmmp21cetlFwXKYx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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