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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e6bafcd94292a541be0e5543e9be9533fdc075c318e504ec1b1a92d2d6803d7' 
  AND token = '9S3bwEzZ03uBIKT5Mj597VmH70UC74rgXkyNefuCTWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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