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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13a97ce97afa091fd8bda3274ab23ac5cfb7f3aaf5db23a04ebdb209b7464c1a' 
  AND token = '2pAgPfcewx3MjVWMOHVr2MEwWnDxxww2Wm5aKaz0k60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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