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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ded64babef4869de07e22655d8a7b5cba700509e55c4c10494d7d48d414e0206' 
  AND token = '1I7nVEq3ctoJD/Q1mAXwKwTi/2UOtutIg+RMALbHLVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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