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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8a37d5c8308c75b155651ed388ad8afe57865a0467109d336d94d7481107281' 
  AND token = 'elgfV/4O3bOpxmy1uJ8s3CgN9kQ9yTLFjdXVIpTRNmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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