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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c0ecd44410f8f2c6b8e52736ae4922820024c50a79aa87ecba307e34e94ed5f' 
  AND token = '89QUQUQ532XeKY4D1iDBzTwWySzKUiOZ5GVf4Gqht1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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