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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3266fa383dd63e893f609ab93459961670e41ebbb808074a034d0206f4006c40' 
  AND token = 'ViAQLrWxUN3uhjmCi7SXWIQhPyH0aikpZSLK9cPiHh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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