SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b11ecd829fcefb213f5401440388299e658977fcf98989134a0936dd2f501b3' 
  AND token = 'cdoj7yzXZpgQcv7lG6Inhebw6LYitaAslX3njYfoL+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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