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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad9f861f842f85759a3fc3b2c947814749f6113d3165dc29f9d4a885b556ecd' 
  AND token = 'kPm5/0qrjjWBIiSOrM58J/o97ckYFYb5o3vpojGtJ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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