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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd318f238a89cdbfcff8e20d1066d42cda077ac476b09c347ad6dbffa39e4bfa4' 
  AND token = 'xMCFlP4GKnhFi39DAlpcJgb/k/j6fNp5j+AltPmqp8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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