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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e74d4421ea163df60bb0d9dd5ec8e9c9c831b50dccac29667d24c64f148c9a5' 
  AND token = 'HQpLJqoeX6PXh9HSDyxcDFQnJSvUZJtykvSLrodMoMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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