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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd477c63fce8b00b109f0ae5e5e0923285a1d933df0e522e92305eb5942c0572' 
  AND token = 'qwuk/0kM6DEqJf7k2YoORNqOJH8nkuhn2N/Kay6aheo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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