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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdeeb4e06549bb601116a32c5c98087ca7d7309be7fa4e1d79f68788e75f5f32' 
  AND token = 'UcVjjEMKmW78VGC0N7KzBfiMdjShtizEPoGbT1SdnU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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