SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dc9c0548bce08a574dc3cc5d208eecf29143d98799760407a9b2fcd00b82afa' 
  AND token = 'gzxmR52QO4KQZ3BWymU9FrVz+hPlGd3JgE6U1Y45OCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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