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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85f6c1b39b37e3d3ef855e5ba6dde5fa8c3a3054f31d062930ba6e322c3bfc81' 
  AND token = 'AkONohyB/Gmb+URGJTexZ67yQm5ClRzBU0DLb5iTe9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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