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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12f304ce97fd5cded5af2b65d3cf1def5b4df0e7bea06ab5ea5f1289d14ade72' 
  AND token = 'Dcgazmgos6WaF9O1jJNALx7besK1mHPA22nUBCuhUVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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