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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c8cd8248e568d7ea89062cb90410a421445233837c043eec26798debcace9c8' 
  AND token = 'kI0jNZnXYAJe4Gov4zigE3R4GPho5Zt1cI6vv6lt6uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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