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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a8d9ce602c4e2c006bd10c5469a97e6e8aecf2453204f9b8647b644cb01a7a0' 
  AND token = 'kB37H6J67kCa65UquUlaEUPaGKuFDq/E/u+jaHLFqus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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