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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dca99646b85d48ee34212d83b0f76546921a636849fce4798829616e7075847' 
  AND token = 'HHP/9d1bG4pkRJcSVTGfZLvTwkeiHNeXx/9u2yidAU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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