Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a714eb470ed76385fc67b2ea63f5f7cda63fcd383dc62dd86fd4068b10870de' 
  AND token = 'vJrP+a/l2QYFh+KLMto3Ec14AEIkMSRfzaj0zYZP2t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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