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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6ccf2e9a699d2fb33de37c46adb582d59a6077d13e256bd2564a8e6df47363a' 
  AND token = 'oFNDDL2We4XmNcVVTftJcdDZpg77hzjFA6FQx8/xq1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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