SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba620de266983baf73bb96c340ace2907ec51529f5d84d5266a5ba3412b9e7c5' 
  AND token = 'i7KjLz91mW9LRVu0o1E5+qzPdggXAwRliryLO4pzx0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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