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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ca615de3f4d830b0081ff9d481931317ec8aca4e6dfe113eef162e98a3ea91a' 
  AND token = 'gzinfIEPfxwoHP3yJQ/SLWDv//ztFIJZkX1fsQWxjwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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