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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '704effccafd8a92cd9d3c5f79a2bd1e634ff687b5f30a98afd5e412c2ecbc059' 
  AND token = 'o8aFBK5j2qpRkXFn86B9iOAwWspX+Ai0EYTqe12fHAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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