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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de276c2c0a61ae2db9cb5649d278698471c2ce3c017ff39b72e4e467394426b4' 
  AND token = '7zFOrV1ksJoa2xQbR60ceobwQshPUlfy6h18/IFNozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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