Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d3e543882f7ef63012bcd1f43f6826d83f25c10bc3f39d196c25d99efafecec' 
  AND token = 'N5JIcr/Uc8YUpLja7QnGvDfsYZRDcfUDlaiyLyRNTlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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