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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18cf2504ca31cdd0d5bba9f9f293cfbd27d566d2cde6739f5a65cc74d31ab166' 
  AND token = 'ybS/Bp4u0AU45Vof5PTZLBDUivNd17Ac0Y9CkM4tLwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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