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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c097c1a40c184d888ceb5a5d2ac0cb7a4d3a4e83f298cba5c25a6c244dd7e38' 
  AND token = 's5T5wT5ioMVBNHQ1u/XLcaynSrNGBPclEO4GpMstfrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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