Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27da15c118ecccaf9024bf06db152c7033a701cd6ed7f469d0f5ecb9ad7da549' 
  AND token = '3meYo+K0RTuKnefgDbkIWGd+zb0vVevpo1/54+XTe/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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