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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c80be37163792856f493b516eb30d231f739811cc4a6a0415d99aaafcbffd6b3' 
  AND token = '5lAF3VP8/nkkGgZuo/SeLlWm/ebQ32A/uxKR8DI3PbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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