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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd46ef87c9ffecb0f5f5d2593abb8ba314e93c255398605005c6efadd88720ec4' 
  AND token = 'vBDG7rekPFLMxv2kBxauD7cJmaA/5wvll8G+Wn09s6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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