SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b272d49c5b5a13d36292760b25b5b8aed4c0d00793141d814a457a8deb87447' 
  AND token = 'lLc3DJ05Uw2HDfOzIfwViNf+dYWRZeTqR8AKg9dByAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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