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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd8852ee15ea7198c4de8af3e70bd66671196a30d985c9f243843a385e28367f' 
  AND token = 'deNX/HY56EOVqWuYPVE2U6sEmAMW7Hr3ndS8rCtYapM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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