SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9d1bc51e383292c9e55d266205adfe7a9c7e23a7702c8e234246bf38e4d6f7' 
  AND token = 'hI9qP5/uAFGJoKWPN2FIXxF/seT8C42j/Fq8v4lAgjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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