SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca6acefc4265524f06b7237daeb354c5720edad99528ad7a01a20cbc24c34613' 
  AND token = 'noBGgpVqE24xS/nXyvwHfbNfr9YjAedYeK1zfBRfub8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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