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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1428a410aee807177edb43a6c7e8decfc020556932ab58e86b7a0760e133c926' 
  AND token = 'UxOZnMaJB5DMnEYyW5vIpe5IhLCOACBxmMpN+/Yu8uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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