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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc5ce499151359c075de5be6323fca959345e850647a4d8be00e34b7659aafd' 
  AND token = 'rspYiQs1sITwcQn5VggIv78Qg9xQZkkGrivvioGYeSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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