SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa4f96595874a025aa97f0cd8002d7e92b82f94f1a9327a6ea430d5abf70d3e8' 
  AND token = 'qBKab1TfKk9QzZyz1Vg7JPr9EyYi8Y/HhYT1BqXDW58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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