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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce600fe30d45a7582050b0b7050d562f7521762f05487cc518f100557ed3099' 
  AND token = '1CyTimNdeUHDugA5uikJWVY3sTPpkD7L5oSKvnNxNxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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