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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9acf9d6782f3b5518338cabbcf57fc77238f60082162a5f29a8a8ecd3661ed9c' 
  AND token = '1Ks0sHzTsCIwCoWSm7C1HvwOIrZTeqnkvOeiPdJv3Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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