SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '091329f4a2510197d5fb5c02df982c521c1bc0bfa83e8e281a5665668a68597d' 
  AND token = 'KHxQj1sUJ1whEDBZ/ZaGM5QIXogMMGb+treBxliGmuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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