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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71dc3a520504430bbf18df018cbeedb83a68e831e9ac9706ba81387368c57904' 
  AND token = 'tMVIddrNmq6q4PqdbTiDktL23iFeIY5Bbkl2xr+252k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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