SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43274ced9d9f6abf5ce2bf15f6c1fa0a070c06d6f75e42f2a91ade78242330a4' 
  AND token = 'oOBaIxuWQQmpbjI/Aecrsyhjx3HmJ+++Kf1vwtALWVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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