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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9825d835f21b555976eae14484410f17e6379fe3f93db614bae159aad13cf01e' 
  AND token = '8vVMOlRCd2pF/00wLagLIsNS/GFiECANUthnfL7gji8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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