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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85275385c671b90f83b82ea20c40f324ed5a08f6f1c21b19e83833dd33b8a2fd' 
  AND token = 'O17hNNofoS4AG2656sLzUWLH3T9u/XO7PvlF6/CMOqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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