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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00fe39e868b0daaaa95ad07113e42fe673d9afa8f92270009492eb77e65b82ab' 
  AND token = '5OAUXiGX0aQ23Bq0Xu9ZWSeNBCeB3MeEBoGE+1dVJUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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