SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e64212506553ef5de7e6a002444e0e4777f03a5ac0a0c4971892d05cbdc8738' 
  AND token = 'LqMvKs2X7cjR8ZjDafdAYVqHg3w+pc6AZ1Q2rDKM+hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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