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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69bf7fd6a961d77ae06375d3c9b7fb9340ea07ed7968d993415b2ea78dd04cb9' 
  AND token = 'oBuRhWddTW/skrOkZPDxFppHwgg0noL7StMjc7p7YMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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