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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4062ff46f100792066196812273c52e8e159f2ab114e584210c6dd5c11bd8a4' 
  AND token = 'NcD8/op7pd1eGuPJPFMDUOaXrcIjAPwtEN17unvnIpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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