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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b504f4a855e8726253445e0845987f73f8007b8b31d07d70ca22abb55eaf4941' 
  AND token = 'XzbDpUPWRyaiI6MzcbQaKSin2ayMKOu6LUlWrF32Hs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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