SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20906279e271843046282c87c20a305a7da4dcac824305bf1fa0605268f88f69' 
  AND token = 'zVHmE/uQP7M2IlnGs+9N4Zzo8G/0L4k+ZmPpj+ilMzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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