SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64260a3c1aa6b50f701cede0b8ed43b55f9a1e2a082fcd54e4f6bb81aa83b0f0' 
  AND token = 'Q+xKzH5vq1RwvBk1FJ22KbTPJfeccYRwtYjy0g3jYQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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