SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7a842ad5a0005d0fc2cbd06b81324ea9ee668673b37e8469365010d4bec4f4f' 
  AND token = 'kRwN9hqzOZ/CmAoSzMgx6vZ7b4I7bWktBcMJOIsnvUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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