SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f86d8aada82819a67beddc80d06d13bca803ac5396a244822b6444c72decfbe' 
  AND token = 'WYs1OJT6CF01wC1+DuV2h3SuiP2BtJMUlK+p1Qgpzvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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